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Forces and Newton’s Laws

Forces and Newton’s Laws. What is a force in science?. In science a force is simply a push or a pull. When one object pushes or pulls another object it is exerting a force on that other object. Which object is exerting the force? Is it a push or pull force?.

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Forces and Newton’s Laws

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  1. Forces and Newton’s Laws

  2. What is a force in science? In science a force is simply a push or a pull

  3. When one object pushes or pulls another object it is exerting a force on that other object. Which object is exerting the force? Is it a push or pull force?

  4. Which object is exerting the force?Is it a push or pull force?

  5. Which object is exerting the force?Is it a push or pull force?

  6. Which object is exerting the force?Is it a push or pull force?

  7. Where is the force coming from here?Is it a push or pull force? Here is a tough one… can you figure it out?

  8. Forces are described in two ways. • How strong the force is • What direction the force is

  9. We illustrate forces with arrows. The wider the arrow the stronger the force while the direction of the arrow shows the direction of the force

  10. If the forces are going in the same direction you add them together to find the net or overall force

  11. -If forces are going in the opposite direction subtract them. The bigger force “wins” so the net or overall force will be in that direction

  12. When you add or subtract the forces and get a net force other than zero, the object that is being pushed or pulled will change its motion in one of three ways.

  13. 1. It might start moving or speed up

  14. 2. It might stop moving or slow down

  15. 3. It might change direction

  16. Did that sound familiar? It sounds familiar because speeding up, slowing down or changing direction are all examples of changes in velocity or… Acceleration! Anytime an unbalanced force acts on an object it will accelerate

  17. If the forces exactly match each other we call them balanced forces. Balanced forces cancel each other out so there is no net force and there is no change in motion.

  18. If the forces do not exactly match we call them unbalanced forces. These are forces that do not cancel each other out – so there is a net force which causes a change in motion.

  19. Go to text book page 315 and look at the three pictures of the people pushing on the boxes.1. Which two examples show unbalanced forces and why?2. Which one example shows balanced forces and why?

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